140 
INDEX TO NORTH AMERICAN GEOLOGY, 
[BULL. 203. 
Petrology— Continued. 
Canada. 
Amygdaloidal trap rock, Dresser, 240. 
Areas of nepheline-syenite, Miller, 550. 
Geology of Rigaud Mountain, Le Roy, 492. 
Hornblende lamprophyre dike at Richmond, 
Dresser, 239. 
Iron ranges of the Lower Huronian, Coleman, 
155. 
Petrography of Mount Orford, Dresser, 241. 
Petrography of Shefford Mountain, Dresser, 
242. 
Report of section of chemistry and miner- 
alogy, Hoffmann, 380. 
Colorado. 
La Plata folio, Cross, 176. 
Occurrence of limburgite, Stevens, 728. 
Spanish peaks folio, Hills, 374. 
Connecticid. 
Newark system of the Pomperaug Valley, 
Hobbs, 376. 
District of Columbia. 
Washington folio, Darton and Keith, 200 
Georgia. 
Granitic rocks of Georgia, Watson, 181. 
Origin of the phenocrysts in porphyritic 
granites, Watson, 789. 
Trap dikes of Georgia, McCallie, 513. 
Weathering of granitic rocks, Watson, 791. 
Idaho. 
Geology and water resources of Nez Perces 
County, Part II, Russell, 662. 
loira. 
Iowa dolomite, Knight, 445. 
Maim . 
Andesites of the Aroostook volcanic area, 
Gregory, 322. 
Geological study of the Fox Islands, Smith, 
707. 
Maryland. 
Basic rocks of northeastern Maryland, Leon- 
ard, 491. 
Massachusetts. 
Amygdaloidal melaphyres of the Boston 
basin, Crosby, 173. 
Medford dike area, Wilson, 838. 
Structural relations of amygdaloidal ruela- 
phyre, Burr, 97. 
Mexico. 
Ein Profil durch den Ostabfall der Sierra 
Madre Oriental, Bose, 72. 
Las rhyolitas, Ordonez, 573. 
Minnesota. 
Keeweenawan area of eastern Minnesota, 
Hall, 332. 
Keewatin area of eastern and central Minne- 
sota, Hall, 333. 
Montana. 
Missourite, a new leucite rock, Weed and 
Pirsson, 799. 
Petrograpny of Square Butte, Pirsson, 616. 
Petrography of Togo peak, Pirsson, 517. 
Shonkin Sag and Palisade Butte laccoliths in 
the Highwood Mountains, Weed and Pirs- 
son, 798. 
New Hampshire. 
Albany granite and its contact phenomena, 
Hawes, 349. 
Petrology— Continued. 
New Hampshire— Continued. 
Composition of labradorite rocks, Dana, 192. 
Eruptive rocks in Campton, Hawes, 348. 
Rocks of Lake Winnepesaukee, Washington, 
785. 
Neiv Jersey. 
Serpentines of Manhattan Island, Newland, 
565. 
New York. 
Adirondack augite-andesite, Cushing, 184. 
Geology of Rand Hill, Cushing, 185. 
Serpentines of Manhattan Island, Newland, 
565. 
Oregon. 
Coos Bay folio, Diller, 231. 
Pennsylvania. 
Occurrence of serpentine and talc, Peck, 590. 
Vermont. 
Granite of Barre, Finley, 272. 
Washington. 
Clealum iron ores, Smith and Willis, 709. 
Geology and water resources of Yakima 
County, Smith, 70S. 
Wyoming. 
Spherulites of the Yellowstone and Great 
Britain, Parkinson, 586. 
General. 
Chemical study of the glaucophane schists, 
Washington, 786. 
Foyaite-ijolite series of Magnet Cove, Wash- 
ington, 783. 
Foyaite-ijolite series of Magnet Cove, II, 
Washington, 784. 
Metasomatic processes in fissure veins, Lind- 
gren, 495. 
Nitrates in cave earths, Nichols, 566. 
Origin and classification of gneisses, Gordon, 
296. 
Outline of elementary lithology, Barton, 44. 
Perknite (lime-magnesia rocks), Turner, 745. 
Variations of texture in Tertiary igneous 
rocks of the Great Basin, Spurr, 724. 
Rocks described. 
Alaskite, Spurr, 724. 
Andesite, Gregory, 322. 
Andesite, Lawson and Palache, 484a. 
Andesite, Smith, 708. 
Anorthosite gabbro, Cushing, 185. 
Arkite (leucite-porphyry), Washington, 783. 
Augite-andesite, Cushing, 184. 
Augite-syenite, Cross, 176. 
Augite-syenite, Cushing, 185. 
Basalt, Diller, 231. 
Basalt, Lawson and Palache, 484a. 
Basalt, Smith, 708. 
Biotite-granite, Spurr, 724. 
Biotite-rhyolite, Spurr, 724. 
Camptonite, Dresser, 239. 
Covite (shonkinite), Washington, 783. 
Diabase, Dresser, 241. 
Diabase, Leonard, 491. 
Diabase, Wilson, 838. 
Diorite, Cross, 176. 
Diorite, Darton and Keith, 200. 
Diorite, Leonard, 491. 
Diorite-gneiss, Darton and Keith, 200. 
